Re: [PATCH -v3 0/15] x86: Remove support for TSC-less and CX8-less CPUs

Borislav Petkov
2026-01-04T13:08:31Z

On Mon, Dec 15, 2025 at 02:55:27PM +0100, Ahmed S. Darwish wrote:
> If it does, then we can also remove X86_FEATURE_CPUID from word 3:
>
> --- linux.orig/arch/x86/include/asm/cpufeatures.h
> +++ linux/arch/x86/include/asm/cpufeatures.h
> @@ -94,3 +94,3 @@
> #define X86_FEATURE_NONSTOP_TSC ( 3*32+24) /* "nonstop_tsc" TSC does not stop in C states */
> -#define X86_FEATURE_CPUID ( 3*32+25) /* "cpuid" CPU has CPUID instruction itself */
> +/* Reserved ( 3*32+25) */

s/Reserved/Free/

so that it gets reused.

--
Regards/Gruss,
Boris.